Ore-roasting furnace.



C. E. MARK,

ORE ROASTING FURNAUE.

APPLIOATION JYILED F3321. 19034 RBNBWED AUG. 6, 1909.

952,680. Patented Mar.22, 1910.

2 SHEETS-SHEET 1 C. E. MARK.

om: BUASTING FURNAGE.

APPLICATION FILED PEB. 21, 1903. RENEWED LUG. 6, 1909.

Ptented Ma 3 SHEETS-SHEET 2.

W QL/ fis UNITED .STATES PATENT OFFICE.

.CHARLIE E. mmf, orcrcaeo, ILLINOIS speciacaun of Letairstent. Patented Mal- 22, 1910,

Application led February 21, 1903, Serial No. 144,430,A ,Renewed August 6, 1509. Serial No. 511,848.

To all 'whom-'it may concern:v p Be it known that. I, CHARLIE E.' MARK, a citizen of the United Sltesof America, and resident of Chicago, (it ikcountj', Illinois, have invented a certain new and useful Iniample, the said hearth -inaybe composed ofv tire-brick, fire-clay, or other like refractory materials, or it may be'composed tif-sandA Y pressed into the proper form by hydraulic or other "pressure, in a manner similar to' ordina'ry sand brick.' As stated, however, Vthe hearth may be of any suitable material,

and can be constructed otf'any4 subisitaiiceadapted' to be formed with peroratiolis or'.

` troleuin burners L .apertures of definite size 'and location, and capable of\ resisting disintegration during the roasting of the oresl- Andinconnection with a hearth of thisfchfai'facter, illy-'inverti tioii also contemplates"suitable means' for the perforations or apertures of the-hearth, so as to produce'the desired oxidizingior otheraetiori on the ore resting on the hearth. The nature and advaiitages of iiiv'jnvtntion will, however, vhereinafter more lfully appeal'. V e Y In the accom )an 'ing drawiiigat#v t`igure l is a loiigitutina sectionmof 4thehearth 2 is a cross-section' oii a smallerscale of u roasting furnace provided with my improved hearth. l" 1g..3 is a plan' o'f my improved j hearth, a portion of the hearth beingv 'iug an inlet a for the pulverized ore, and,

having an outlet a through which ,the ore is 5 discharged after it has` been roasted. The

proveinent in Ore- Roasting t Furnaces, `of

-forcing air -or other gas ,upwardly throughportion of Ja roasting fnlnace*having' a.

ii'oken' away to show the air pipes. .FigiV 4 is an enlarged cross-section of a portion of my ordinari"'mechanical rabbles B can be employedfor stirring.;r the pnlverzed ore on the hearth, and for causing the same to elowlyI progress' from the inlet end of the hearth tothe discharge, at which latter part the roasted ore then descends through the disehargeopening a. These ralihlef; are, it, will he observed, in the fcrin of link-belts b provided with:angnlarly arranged buckets or projections b', adapted to slide forward over the hearth. y The lower leaf ofthe belt- .likel structure composed of the sprocketehaina and projections is, of course, arranged to lieclose tothe surface of the hearth, and the upper loa-fof the belt can travel outside of 4thereof or .top wall o of the furnace. Sprocket`\\'lieels b2 support the link-belts at each end of the furnace.

x'llie heat,` can be supplied by gas `or pel shown in dotted lines in Fig. 3 Vand in full lines in Fig. 2. These burnersvcai'i be vpipe-connected with the lateral openings a, extending through the side walls ofthe furnace, and with this arrangement the draft will be from the burners through the interior of the furnace and Jtlience lip'throu li the stack D. My iinproved hearth t may consist of a single slab' of tire-brick or fire-clay having the 'aperturesY or ockets e, which, it will be seen, are preferab-y' of definite size and location. Thishearth can, however, be composed of any other lsuitable material which will not disintegrate during the process of roasting' the ore, and can be constructed of'either one or several pieces. Below this furnace roper I arrange a number of pipes F, eac i provided with apertures f, and each connected at one end with a header or supply,7 pipe f-. These pipes 'are preferably supported 4upon a laver of crushed rock or other like material ,which in turn restspreferably up'oil a layer of earth H. Above the pipes some fine material,'such as sand, asbestos,

. or other, finely porous materiahl, can be.

arranged.' Thus the hearth structure Vas a whtile is preferably made up of an upper layer havingi apertures or pockets', a lower layer of earth or other like material, and

Yil,'iteriiiediate layers of crushed rock, asbes- `tps, sand, or other like material, the structure as a whole comprising a system of pip- 'ng inter osed between the` layerof crushed 'rock an the layer of material which is yhelowlthe perforated or apertured top layer.

then be starte so as to simultaneously roastf and agitata ore in the usual and .wellknnwn i manuel'.

' the 'the chute or openingy @,where it is `then conveyed i so , and adipted to more eiiicientl saine.

As shown inf the drawings, the general construction ofi the 5 furnacel is of Ithe wellknown type em loyedfor roasting old sultids. For such purpose, the -su fids are usually crushed and nely pulverize'd, and thislpulveri'zed material is then s read upon earth, it being preferably ed through to and .acrossthe .hearth by `the rabbles. In such case, the pulverized ore will of course `illt'he apertures or pockets of the hearth, but this. will in no way interfere with the upward passage of the *air through the hearth, inasmuch as such pulverized -V material is `finely porousthat lis assage yof the air or gas.

econnected with a suitable source of air pressure, Aand the air, passing upwardly through the hearth produces the desired oxidizing eilect'on 'the sulds or upon the vother ores or materials roasting on the' hearth. With `m im roved arran ement, air is passed easi y an evenly up t rough the hearth, and the eiliciency 'of the hearth in this respect is in no wise decreased or interfered with by allowing the rauw to drag onnits'upper surface. Y

The rabbles ma if such is desired, be provided with ro 1s fr"` adapted to travel on thetracks or walls YXarranged ateach side'of the hearth, s as to prevent the pro- 'ections ffrom dragging on the hearth. owever, as stated, this feature may be dis"-` pensedwith in view of the fact that with my improved hearth construction theii rabbles may drag on the upper surface of the hearth without 1n any way injuring it, andwithout in any way interfering `with its function of feeding oxygen upwardly to the pulverized su lids.

' Thus it will be seen that Iprovde an iinproved roasting furnace adapted more particularly for use inroasting various ores, oxidize the nd furthermore, itwi 1 be seen that withiny improved hearth construction air .for oxidizing the ore can be effectively passed upwardly throughl the hearth, the air being distributed evenly throughout the mass of ore, and the hearth 'structure as a whole beingpermeable to air but impermeable tothe materials resting upon'it. In the A case of pulverized, gold sulfide, or other anular material, the hearth proper, or per*- gdrated up er la er of the hearth structure may then sai to be composed of a. solid layer having pockets ,filled with porous to sa;y of suticient' porosity to permit the- The pipes can'r granular material. In other words, in 'suon case the granular material inthe pockets Vmay be regarded as constituting -a partf of the hearth itself. And with the provision of this solid a ertured Vupper layer, the hearth is not on y of a character to permit the air to be sup lied to the ore in this particular manner, hat also of a character to permit its upper surface to bescraped and cleaned o'i whenever such is desired. As another advantage, it will be seen that my improved hearth construction is of a Acharacterd to permit .the iabbling lto be done either mechanically or by hand.

I claim as my invention 1. A roasting furnace provided .with a hearth structure having au upper layer of solid and rigidly united material' provided with a ertures, and means for passing air upwar 1y through said a rtures, together with porous means adapte and applied-for preventing the .ore from falling through the, said apertures. A

2. An ore ,roastingffurnace corriprisin'gaV hearth structure-composed of superimposed layers, the upperila er being rigid or' im-. movable and\` provided with apertures of definite size and location,fand means for passing air upwardly through said-apertures, together with porous means ada 'ted and app ied for preventingthe' ore' om fallnv through the said apertures;

3; n ore roasting furnace 'comprisinga hearth provided with .pockets,.means or passing air'upwardly through said pockets, mechanical rabhles arranged above' Said hearth,vand porous means adapted and ap? .l Y

`agianged in said porous material and a aptfor supplying airV through said apertures to the ore.

ace comprising a 6. A `roasting/furnace comprising iig-hearth or bed having a smooth u per'surface'- provided with 4apertures of ciablesize each a rture bein circumscribed ,'and separate from the ot er by invtegral or rigid y united material, porous ma terial adapted' and a plied for prevent-ing the ore from falling trough said apertures,

together with mea-ns for forcing air upwardly through said porous material and apertures and into the ore resting upon the said hearth or bed.

7. A metallurgical furnace eomprisin a hearth or bed of-hard material provi ed with apertures of definite or appreciable size, each aperture being circumscribed and separated from the other by integral or rigidly united material, porous material adapted and applied for preventing the load car ried by the said hearth or bed from falling through the said apertures, and means for forcing a fluid treating agent upwardly through the said porous material and apertures, and into the said load on the hearth or bed.

8. A furnace for treating materials, comprising aA hearth or bed composed `of continuous and rigidly united hard material provided with apertures of definite or appreciable size, porous means ada ted and applied for preventin the materia s carried on the hearth or bed rom fallin through the saidI apertures, and means for orcing a fiuid treating agent through the said porous material and apertures and into the materials on the said hearth or bed.

9. A roastingA furnace for roasting gold `which are held firmly and rigidly against either lateral or upward displacement, openings in said hearth, porous means for reventing the material on the hearth from alling through said openings, and means for forcing a fluid through the porous material and openings and into said material on the hearth.

Signed by me at Chicago, Cook county, Illinois, this 17 th day of February, 1903.

CHARLIE E. MARK.

Witnees:

DAISY OVERBAUGH, WM. A. HAnoEns. 

